NFCのトピックRe: PN548 proprietary 2F 31 01 00 Rejected

PN548 proprietary 2F 31 01 00 Rejected

limneos — Thu, 17 May 2018 10:03:03 GMT

After manually sending several commands to PN548 , now on each startup when 2F 31 01 00 is sent by the controlling software, it returns

4F 31 01 01 - REJECTED and the software crashes there.

The software's startup sequence is:

TX: FF FF 20 00 01 00 (I'll be omitting FF FF from now on)
   RX: 40 00 03 00 10 00
TX: 20 01 00
   RX: 40 01 15    00 03 0e 03 00 04 00 01 02 03 02 c8 00 ff 02 00 04 08 02 01 26
TX: 2f 02 00
   RX: 4f 02 05     00 00 00 93 e5
TX: 2f 00 01 00
   RX: 4f 00 01    00
TX: 20 03 03 01 a0 0f
   RX: 40 03 45   00 01 a0 0f 40 1d 01 26 01 a5 a5 c3 c3 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
TX: 2f 02 00
   RX: 4f 02 05   00 00 00 93 e5
TX: 2f 31 01 00
   RX: 4f 31 01   01
whereas the response to that before , used to be
   RX: 4f 31 03    00 00 10

After searching the logs, I found that the last command I sent that got a response was

2f 02 08 01 A0 0D 04 32 03 40 3D

with a reponse:

4f 02 05 09 00 00 93 e5

where I mistakenly used 2f instead of 20 trying to set an antenna register.

Does anyone know what 2f 31 does and in which manual its refereed, so I can reset some values and resolve the issue?

(I dont' have access to the controlling/driver software source code, so I probably need to set a value back to its defaults in order for this to get back to working)

Thank you in advance!

Re: PN548 proprietary 2F 31 01 00 Rejected

limneos — Thu, 17 May 2018 12:50:41 GMT

To answer my own question, I managed to fix this by sending this command and restoring the value:

A0 0E 03 02 09 00

A0 0E 03 03 00 00

which I had thankfully backed up a list of all registers first.

Thanks.

Re: PN548 proprietary 2F 31 01 00 Rejected

limneos — Thu, 17 May 2018 12:54:28 GMT

For the record, though, if anyone knows what value is at A0 0E and why 2F 31 01 00 fails if its changed, I'd really appreciate the explanation.

Re: PN548 proprietary 2F 31 01 00 Rejected

limneos — Thu, 17 May 2018 18:54:39 GMT

I found that A0 0E is the VBAT setting for 3.3, 5v etc.... Still I don't know what 2f 31 is. I've found in manuals:

2F 30 (TEST_PRBS_CMD), 2F 3D (TEST_ANTENNA_CMD), 2F 33 (TEST_GET_REGISTER_CMD) but not 2F 31...